ZyXEL Communications SBG5500 Series User Manual page 61

Table 12 WAN Internet > WAN Setup > Add/Edit: Routing Mode (continued)
LABEL DESCRIPTION
VCI The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local management of ATM
traffic). Enter the VCI assigned to you.
Encapsulation Select the method of multiplexing used by your ISP from the drop-down list box. Choices are:
• LLC/SNAP-BRIDGING: In LCC encapsulation, bridged PDUs are encapsulated by identifying
the type of the bridged media in the SNAP header. This is available only when you select IPoE
or PPPoE in the Select DSL Link Type field.
• VC/MUX: In VC multiplexing, each protocol is carried on a single ATM virtual circuit (VC). To
transport multiple protocols, the SBG needs separate VCs. There is a binding between a VC
and the type of the network protocol carried on the VC. This reduces payload overhead
since there is no need to carry protocol information in each Protocol Data Unit (PDU)
payload.
Service Select UBR Without PCR for applications that are non-time sensitive, such as e-mail.
Category
Select CBR (Continuous Bit Rate) to specify fixed (always-on) bandwidth for voice or data traffic.
Select VBR-nrt (non real-time Variable Bit Rate) for connections that do not require closely
controlled delay and delay variation.
Select Realtime VBR (real-time Variable Bit Rate) for applications with bursty connections that
require closely controlled delay and delay variation.
Peak Cell Rate Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell Rate (PCR). This
is the maximum rate at which the sender can send cells. Type the PCR here.This field is not
available when you select UBR Without PCR.
Sustainable Cell The Sustainable Cell Rate (SCR) sets the average cell rate (long-term) that can be transmitted.
Rate Type the SCR, which must be less than the PCR. Note that system default is 0 cells/sec.
This field is available only when you select VBR-nrt or Realtime VBR.
Maximum Burst Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at the peak
Size rate. Type the MBS, which is less than 65535.
This field is available only when you select VBR-nrt or Realtime VBR.
IPv4 Address This is available only when you select IPv4 Only or IPv4 IPv6 Dualstack in the IPv4 / IPv6 Mode
field.
Obtain an IP A static IP address is a fixed IP that your ISP gives you. A dynamic IP address is not fixed; the ISP
Address assigns you a different one each time you connect to the Internet. Select this if you have a
Automatically dynamic IP address.
Use the Select this option if the ISP assigned a fixed IP address.
Following IP
Address
IP Address Enter the static IP address provided by your ISP.
Subnet Mask Enter the subnet mask provided by your ISP.
Gateway IP Enter the gateway IP address provided by your ISP.
Address
Routing Feature This is available only when you select IPv4 Only or IPv4 IPv6 DualStack in the IPv4 / IPv6 Mode
field.
Enable NAT Select this option to activate NAT on this connection.
Enable Internet Group Multicast Protocol (IGMP) is a network-layer protocol used to establish
IGMP Proxy
membership in a Multicast group - it is not used to carry user data.
Select this option to have the SBG act as an IGMP proxy on this connection. This allows the SBG
to get subscribing information and maintain a joined member list for each multicast group. It can
reduce multicast traffic significantly.
Apply as Select this option to have the SBG use the WAN interface of this connection as the system
Default
default gateway.
Gateway
Chapter 5 WAN/Internet
SBG5500/3310 Series User's Guide
61